Spraying apparatus



Feb. A23 ,1926. 1,574,183

H. BoDl-lsH SPRAYING APPARATUS Filed Dec. 17, 1924 2 Sheets-Sheet l annum Feb. 23 1926. l 1,574,183

H. BODFISH SPRAYING APPARATUS Filed Dec. 17, 1924 2 Sheets-Sheet 2' INVENTOR H0 wes Enq/(6%,

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Patented F eb. 23, 1926,

UNITED STATES 1,574,183 PAT-ENT oFFicE.

HOWES BODFISH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO C10-OPERATIVE UTILITIES O0., INC., OF PHILADELPHIA, PENNSYLVANIA, A CORPORATIONv OF DELAWARE.

SPRAYING APPARATUS.

Application 'filed December 17, 1924. Serial No. 756,541.

To all whom t may concern Be it known that I, Howns BoDFIsn, a citizen of the United States, and a resident of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Spraying Apparatus, of which the follow# ing is a specification. .j

The present invention relates to spraying apparatus, and more particularly td' means for projecting material in plastic form.

Some of the objects of the present invention are to provide an improved apparatus for'spraying material" of a plastic nature; to provide a pressure operated spraying apparatus whereby the velocity and quantity of material can be proportioned as desired; to provide a plastic ejecting means wherein the material is subjected to a uniform discharging pressure throughout the area of the appliedA force; to provide improved means for cleaning a spraying apparatus after use; to provlde an improved piston discharging means for plastic material sprayers; to provide ya piston for material sprayers which eliminates the necessity of piston rods or guides; and to provide other improvements as will hereinafter appear. In the accompanying drawings, Fig. 1 represents a side elevation in p art section of a spraying apparatusembodylng one form of the present invention; Fig. 2 represents a plan of the casing of the sprayer, and Fig. 3 represents a detail of the cover hing-- ingmeans.

-eferring to the drawings, one form of the lpresent invention comprises a casing 10 lower end of which is seated u on and closed by a supportin base 11, whi e its opposite endis arrange to be closed by a cover 12. In the present construction, the casing 10 is removably fastened to thebase by stud bolts 13, and leakage at the joint between these parts is lprevented by an annular packing 14 whic encircles the closure portion 15 of the base 11. The cover 12 conforms in size and shape generally to the configuration of the upper end of the casing 10, and is attached to 'the latter by means of a hinge formed by a tongue. 16, .which is integral with the cover 12; two ears 17, Aformed on the casing 10 to receive the tongue 16 between them, and a bolt 18 passing through the tongue and ears for e form of an open-ended cylinder, the' pivotal action. -Suitable bolts 20 are 1ocated j at convenient intervals about the flanged edge of the cover 12, in'order to clamp it rigidly to the upper end of the cas- .ing 10, and a packing ring 21 is provi-ded to prevent leakage at the joint between the casing 10 and the cover 12. It will further be. noted that the body portion of the cover 12 is substantially conical in form and converges to a discharge opening 22, which is co-aXial with the longitudinal axis of the cylinder 10.

For 'the purpose of forcing the contents of the casing 10 out by way of the discharge opening 22, a piston 23 is provided, the dimensions of which are such that it fits snugly within the cylindrical casing 10, and `has suilicient length to form a bearing against the walls ofthe cylinder to resist any tendency of the piston to assume a position other than perpendicular to the walls` of the aforesaid cylinder. That portion of the piston 23 which is disposed toward the material contained withinthe casing 10 is preferably conical, so that when it is in its lowermost position or at the end of its non-working stroke, the lower circumferential edge of the cone surface will be sub- -v stantially at'the same level as a drain or clean-out opening 24, in the side of the casing 10, which is normally closed by a plug 25. The opposite end of the piston 23 is provided with a washer 25 ofl leather or other suitable material, which is fastened to the piston by studs 26 and is 'provided' with an annular flange 27 which extends parallel and in closeproXimity to the inner walls of the cylinder ofthe casing 10. This construction insures the piston operating 4 pressure acting against the rear of the piston and within the flange 27, so that the latter is forced outwardly against the walls of the casing 10 and forms a leak-proof joint, while also helping to maintain the piston properly positioned transversely of the cylinder. Preferably the piston 23 is held 'at the end of its non-working stroke by outlet 22. the base end ot the casing 10 is p rrwided. with a port 30 formed in the inner wall thereof4 and opening into the space between the piston 23 andthe closure 15. At one side of the casing 10 a supply pipe 31 for pressure fluid communicates with the port 30, while at another location a blow-off opening-32 is provided which is nor? inally closed by a removable plug 33. The pipe 31 is controlled by a valve 34. and connects with a main supply Ipipe 35, extending to a source of pressure. When the valve 34 is open, pressure is admitted back of the piston 23, and causes it to .move in a direction to expel the plastic material by way of the outlet 22.

In order to project the material in spray form as it is discharged from the casing 1Q, the outlet 22 has a pipe 36 connected to a fitting 37 which also receives a pressure supply pipe 38, preferably of the iexible type, which leads from the main supply pipe 3,5 and is controlled by a valve 40. The fitting 37 has a common dischargetor the material and pressure fluid by way of a pipe 41 which joins a iiexible lengths 42, and carries a nozzle 43 on its free end. A valve 44 is arranged on the nozzle v43 for control purposes, and another valve 45 is located in the pipe line 41 for a purpose to be explained.

In the operation of the apparatus the casing 10 is filled with the plastic material which is to be sprayed, and this is done by swinging the. cover 12 to the position shown in dotted lines Fig. l1, so that access may be had to the pistonchamber. The piston 23 is in its normal position at the lower end of the casing, resting upon the stop 28, and the device may be put into operation as soon as the cover 12 is returned to its closed position and tightly clamped to the end of thecasiiig upon the packing 21. In oder to start `the apparatus the valves 44 and 45 are opened, the valve 40 closed and the valve 34 opened suiciently to admit the right amountof pressure which will cause the piston 23 to move toward the discharge outlet 22 and thereby force the plastic material out by way of the pipe 36, fitting 37 fand pipe 42.4 When the discharged material reaches the fitting 37, the valve 40 is opened and pressure admitted by way of pipe 38 to the litting 37 ,A to thereby inject the' material at the desired velocity from the' nozzle 43, and this velocit can be varied to suit conditions by regulating the amount the valve 40 is open, while the quantity vof material delivered in a given time can be regulated by the amount t e valve 3 is open. When the spraying operation is completed and the casing 10 entirely emptied of lasticimatcrial the cylinder can be thoroug lycleaned by removing the plug 25,4 closing thevalve 45 and opening the valve 40, whereupon pressure iiuid is discharged through-'the cylvice is ready te operate upon recharging at some future time. If it is desired to clean A out the lower portion of the cylinder below the piston 23, the plug' 33 may be removed and pressure from the pipe 31 blown directly through this chamber by opening the valve 34.

It will now be apparent that a complete unitary spraying apparatus for plastic material has been devised which is simple in construction and eflicient in operation. Also the construction is such1 that the plastic material is subjected to a uniform pressure throughout its transverse area, while the space wherein the material is confined is unobstructed by connecting rods or any guide means for the piston and because. f this design the discharge outlet can be located co-,aXial with the axis of the cylinder, and in consequence the 'material pressure upon the piston is equally distributed from the center thereof outward and maintains the piston correctl centered wihin the casing. While the p astic material under the' action of the piston moves as amass toward and through the outlet 22, this condition is" changed as soon as it enters the 4fitting 37,

because it is there subjected to the pressure Huid from pipe 38, the -velocity of which,

breaks .up the mass and carries italo'ng in the formof a disintegrated spray. Furthermore, by providing the-pressure side of the piston with'an annular ieirible iiange, the action of the pressure iiuid is to expand this latter outwardly 'against the inner walls of the casing to thereby eectively seal the joint between the piston and the casing,f 105` casing in line with lthe outlet 24, .so that when the latter is opened this residue may be eiectively blown out to clean the cylin-l der.

While only a single form is shown in which this invention may be embodied, it is -to beunderstood that the invention is not limited to an specific construction, but might be applied to various forms without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention, I claim:

1. In a sprayer for plastic material, the combination of a casing having an inlet forpre'ssure u'id at one end, a cone-shaped closure for the other end Iof said casing having a centrally disposed outlet, a piston mounte in said casin between said inlet and outlet and guided 'a ong .by the wallsbf said cas- 13 y clean-out opening located throug the wall ing, pressure means connected to said inlet, pressure means connected to act upon material discharged from said outlet, and separate control means for saidl pressure means.

2. In a sprayer for plastic material, the combination of a casing having an inlet for pressure fluid at one end, a cone-shaped closure for the other end of said casinglhaving a centrally disposed outlet,F a piston mounted in said casing between said inlet and outlet and guided along by the Walls of said casing, pressure means connected to said inlet, pressure means connected to act upon material discharged from said outlet, separate control means for saidpressure means and'forming a passage'through said casing for pressure fluid for cleaning purposes.

3. In a sprayer for plastic material, the combination of a casing having an inletI for pressure fluid at one end, a cone-shaped closure for the other end of said casing having a centrall disposed outlet, a piston mounted in said casing between said inlet and outlet and guided only by the walls of.

' said casing, a stop ,projecting into said casing to support said piston in normal position, and pressure means acting simultaneouslupon said-piston and upon material discliarged from said outlet. y

4. In a sprayer for plastic material, the combination of a casing having an inlet for pressure fluid at one end and anoutlet for material at the other end, a piston vinterposed between said inlet and outlet within said casing, means for supporting said piston at the end of its non-workin stroke, a

of said casing su7bstantia1ly in the plane of the inner end of said cylinder, a plug normally closing said opening, pressure fluid means for simultaneously actlng upon saidl piston for discharge purposes and upon material discharged from said outlet, and means to change the direction of flow of said pressure means 'when said plug is removed to clean said casing.

5. In a sprayery for plastic material, the combination of a casing having an inlet for pressure fluid at 011e end, a cone-shaped closure for the other end of said casing having a centrally disposed outlet, a piston mountedi in said casing between said inlet and outlet and guided only by the Walls oi sa1d casing, said piston having a cone-shaped face disposed toward said closure, and pres'- sure means acting simultaneously upon said piston and upon the material discharged from said outlet.

6," In a sprayer-for plastic-material, the combination of a casing having an inlet for pressure fluid at one end, a closure hinged to said casing having a discharge outlet for plastic material at the other end, a piston freely movable between said inlet and said outlet, pressure means attached tosaid casing for moving said piston to force said plastic material out of said discharge outlet, and pressure means for spraying the material as, it leaves said outlet,

Signed at Philadelphia, county of Philadelphia, State of Pennsylvania, this 8th day ofDecember, 1924.

Howns oDFIsH. 

